| Thomas Ros, 8th Baron Ros | |
| Spouse: | Eleanor Beauchamp |
| Issue: | Thomas Ros, 9th Baron Ros Richard Ros Margaret Ros, Baroness Botreaux |
| Father: | William Ros, 6th Baron Ros |
| Mother: | Margaret FitzAlan |
| Birth Date: | 26 September 1406 |
| Birth Place: | Belvoir, Leicestershire |
| Death Date: | 18 August 1430 (aged 23) |
Thomas Ros or Roos, 8th Baron Ros of Helmsley (26 September 1406 – 18 August 1430) was an English peer.
Thomas Ros, born 26 September 1406, was the second son of William Ros, 6th Baron Ros, and Margaret Fitzalan (d. 3 July 1438), the daughter of John FitzAlan, 1st Baron Arundel, by Eleanor Maltravers (c.1345 – 12 January 1405), younger daughter and coheir of Sir John Maltravers (d. 22 January 1349).[1]
Thomas Ros was a younger brother of John Ros, 7th Baron Ros, who died childless at the Battle of Baugé on 22 March 1421. Thomas inherited his rank and privileges, and followed the example of his brother in participating in the Hundred Years' War. He fought in the Battle of Verneuil under the command of John, Duke of Bedford. He was honoured for his efforts, and knighted by Henry VI of England on 19 May 1426. Henry was a nephew of the Duke. Thomas resumed service under the Duke in 1427. He was summoned to the Parliament of England in 1429. In 1430, he fell into the Seine during a minor skirmish and drowned.
Thomas Ros married Eleanor Beauchamp, daughter of Richard Beauchamp, 13th Earl of Warwick, and his first wife, Elizabeth Berkeley, by whom he had two sons and a daughter:[2]
After the death of Thomas Ros, his widow, Eleanor, married secondly, Edmund Beaufort, 1st Duke of Somerset, and thirdly, Walter Rokesley, esquire.[3]